WorldFloraDB - Rorippa islandica

Characteristics

Annual erect or spreading ± pilose herb up to 30 cm. tall, with rather stout taproot; main stem and branches ± quadrangular in section; branches at very wide angle to stem, terminating in lax racemes. Basal lvs up to 10 cm. long, on petioles ± 1 cm. long, ± ovate-oblong in outline, sublyrately pinnate to pinnatisect. Pinnae up to 1·5 cm. long, coarsely dentate-serrate; terminal lflts up to 2.5 cm. long, ovate to narrow-ovate, acute to acuminate; lowest lflts minute. Cauline lvs similar, smaller, us. ∞.Racemes up to 5 cm. long at anthesis, elongating to ± 10 cm. in fr. Fls small, rather distant, subopp. to alt. on slender sub-patent petioles ± 5 mm. long. Sepals 1·5-2 mm. long; petals obovate-spathulate, 1·5-2 mm. long. Median honey glands developed. Siliques or silicles ellipsoid, ± 5-7 × 2 mm.; valves convex; styles stiff, hardly 1 mm. long, stigma hardly wider. Seeds many, ± oval in outline, very finely papillose, c. 0·5 mm. diam., reddish brown.

More

Annual or possibly perennial; stems glabrous, striate, branched above, 3-6 dm. high; leaves broadly oblanceolate, obtuse, prominently veined, glabrous, erose or irregularly dentate, lower leaves petioled and often somewhat lobed, 5-10 cm. long, 1-2 cm. wide; upper leaves sessile or short-petioled, lobed or merely erose-margined, less than 5 cm. long; inflorescence congested, elongating in fruit; flowers ca. 2 mm. long, petals yellow; fruiting pedicels divaricate, 2-4 mm. long; siliques terete, ca. 2 mm. in diameter, 3-5 mm. long, glabrous; styles less than 1 mm. long; seeds small, less than 0.5 mm. broad, wingless.

A herb.

Life form

annual

Growth form

herb

Growth support

free-standing

Foliage retention

-

Sexuality

hermaphrodite

Pollination

-

Spread

-

Mature width (meter)

-

Mature height (meter)

0.3 - 0.6

Root system

tap-root

Rooting depth (meter)

-

Root diameter (meter)

-

Flower color

Blooming months

Jan	Feb	Mar
Apr	May	Jun
Jul	Aug	Sep
Oct	Nov	Dec

Fruit color

-

Fruiting months

-

Nitrogen fixer

-

Photosynthetic pathway

c3

Environment

It is a temperate plant. It grows in wetlands. In Papua New Guinea it grows between about 2,000-2,850 m above sea level.

Light
Soil humidity
Soil texture	-
Soil acidity
Soil nutriment	-
Hardiness (USDA)

Usage

It is used to flavour fish soup. The leaves are boiled for 5-10 minutes then soaked in water to remove the bitter taste.

Uses	food gene source medicinal spice
Edible	leaves
Therapeutic use	Diuretics (root), Measles (root), Deobstruent (unspecified), Digestive (unspecified), Diuretic (unspecified), Hepatic (unspecified), Stimulant (unspecified), Tonic (unspecified), Detergent (unspecified), Scurvy (unspecified)
Human toxicity	-
Animal toxicity	-

Cultivation

Mode	-
Germination duration (days)	-
Germination temperacture (C°)	-
Germination luminosity	-
Germination treatment	-
Minimum temperature (C°)	-
Optimum temperature (C°)	-
Size	-
Vigor	-
Productivity	-

Images

Habit

Leaf

Flower

Fruit

Distribution

Conservation status

Identifiers

LSID	urn:lsid:ipni.org:names:288759-1
WFO ID	wfo-0000399609
COL ID	4TCPY
BDTFX ID	56364
INPN ID	117939
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Rorippa terrestis Nasturtium islandicum Radicula islandica Rorippa islandica f. islandica Sisymbrium islandicum Sisymbrium islandicum Sisymbrium terrestre Rorippa islandica subsp. islandica Rorippa islandica var. islandica Nasturtium palustre var. microcarpum Rorippa islandica

Lower taxons

Rorippa islandica subsp. dogadovae Rorippa islandica var. microcarpa

WorldFloraDB 2024

Rorippa islandica (Oeder) Borbás

Yellow watercress (en), Rorippe des marais (fr), Rorippe faux cresson (fr), Cresson des marais (fr)

Species

Angiosperms > Brassicales > Brassicaceae > Rorippa